Comment on `A collider signature of the supersymmetric golden region'

We show that $Z$ polarization measurement is useful for distinguishing the signal decay chain of the `golden region' in the minimal supersymmetric standard model(MSSM) parameter space, which involves the stop decay of $\tilde t_2 \to \tilde t_1 + Z$, from other decay chains involving the neutralino decay of $\tilde\chi_2^0 \to \tilde\chi_1^0 + Z$ in different MSSM scenarios.